JPS63256776A - Manufacturing method of plastic turf web for sports ground - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention produces a web of plastic turf for a sports field, which comprises a web of pile fabric forming an upper surface and cushioning elements attached in a lattice pattern to its lower surface. Regarding the method. This is primarily a problem with the method in which plastic turf is used, as disclosed in German Patent Application No. 2051508.

[Conventional technology]

A dense pile-shaped cushioning element made of foamed plastic, as disclosed in DE 2051108, with a lining of elastic material on part of its lower surface, as disclosed in DE 2051508, mentioned above. a base fabric web consisting of a foamed flexible PVC bonded to the plastic web backing to form a pile-like cushioning element on the top surface of the base fabric web;
is heated and then the upper side of the base fabric web is pressed onto the lower side of the plastic turf web and both webs are welded (DE 31 13 636).The method for producing plastic turf has become the current standard. This method does not produce a superior product and is relatively expensive because the base fabric web, including the woven reinforcing fabric, must first be produced in a separate manufacturing process.

In internal prior art, a web of plastic turf is placed on a conveyor belt with its underside facing up;
A plastic mass consisting of pasty foamable flexible PVC is placed in a grid pattern on top of it by a wiper drum, and the PVC is foamed and polymerized by heating and firmly bonded to the back side of said plastic lawn, its lower surface There is a method of making foam plastic cushion elements arranged in a grid pattern. However, the web of ground covering obtained in this way is not able to meet the demanding conditions of sports stadiums, considering that the players exert considerable pressure on this covering.

[Means to solve the problem]

It is an object of the invention to provide a method for producing a dimensionally stable, durable and inexpensive plastic turf web of the type described above. A cushion is created by curing a quantitatively adjustable plastic material, placing it in a grid to form an elastic body, heat-treating the plastic material to form a cushion element, and firmly bonding it to the pile fabric through this process. The method is based on a method of manufacturing a plastic mass corresponding to an element, in which a web of pile fabric, a plastic mass, and a reinforcing web having openings are placed on a conveyor belt, and the reinforcing web is attached to the lower surface of the pile fabric and the plastic mass. so that the plastic material enters the openings of the reinforcing web and wets the underside of the pile fabric, said plastic material is then heat treated and the web of pile fabric, the reinforcing web.

According to the method of the invention, not only is it possible to dispense with the separate manufacture of the base fabric web, but also the reinforcing web is connected firmly to each other. , thereby firmly bonding to the back side of the pile fabric, resulting in a highly dimensionally stable product that can withstand the pressures that occur during competitions on sports grounds. Moreover, the ground covering obtained by this method is
Becomes water permeable. Therefore, a preferred embodiment of the method of the invention is:
It is characterized by the use of a water-permeable pile fabric web with a back side partially coated with a backing material or the like forming a bond with the plastic material for the cushion element.

In order to optimize the dimensional stability of the ground covering according to the invention, it is recommended to use preheat-set plastic turf.

In the production of resin coatings consisting of synthetic resin blocks arranged in a grid and intended to be ironed, i.e. in a completely different field, the fabric web to be coated is placed on top of an endless belt. A wiper drum having a shell with discrete through openings for the synthetic resin powder is then used to place the synthetic resin mass on the fabric web in a lattice pattern, and the synthetic resin loaded fabric piece, nib, is heated by means of heating means. Finally, a second fabric web, that is, an upper layer fabric, is placed on top of the still soft and sticky synthetic resin mass, and this is pressurized to bond both fabric webs together. It is already known to combine
(See Figures 1 and 2゜5 of No. 80).

Apart from the fact that this prior art relates to a completely different field of technology, the synthetic resin mass produced in this known manner is not a cushion element, and the second fabric web is also passed through the synthetic resin to form a cushioning element. The reinforcing web does not have openings large enough to be firmly bonded. Therefore, in the case of this known method, the synthetic resin mass is always present between the two fabric webs, and in the product obtained with this method the reinforcing web is present within the cushioning element formed by the plastic mass. . Therefore, it cannot be said that the plastic mass in the final product is present between the pile fabric web and the reinforcing web; as a result, in the method according to the invention, the plastic mass is initially placed on the conveyor belt; In the end, whether a pile fabric web is to be applied to this, first the reinforcing web is placed on the conveyor belt, then a plastic mass is made and placed on top of this, and finally the pile fabric web is placed on this. Whether applied or first the pile fabric web is placed pile side down on a conveyor belt, then the reinforcing web is placed on top of this and finally the plastic mass is made on top of it. I do not care.

The plastic mass can be deposited individually or in groups by a single nozzle or a series of nozzles. However, it is simpler and cheaper to manufacture and deposit plastic mass continuously by means of a wiper drum with discrete through-openings for the plastic material. In this case, the plastic material is supplied by the cavity of the drum and is applied to the inside of the drum shell with said through-openings cooperating with the wiper.

In principle, any plastic is suitable for the cushion element, provided that it is used in pasty, granular, powder, etc. form and can be converted into a cushion element by heat treatment.

However, due to cost considerations, the use of foamable, flexible PVC is particularly desirable.

The plastic material may be self-curing over time, or may be hardened as an elastic body by moisture in the air, for example after the plastic mass has been produced. However, in order to facilitate the control of the solidification process and for cost reasons, it is desirable to use plastic materials that can be converted into cushion elements by heat treatment.

Therefore, in a preferred embodiment of the method according to the invention, a conveyor belt carrying the plastic mass, the reinforcing web and the pile fabric web is introduced into a heating zone for heat treatment of the plastic material. In order to prevent undesirable deformation of the plastic lawn pile, it is desirable that the web of pile fabric be cooled from the side of the pile in the heating zone.

For example, the reinforcing web may be a tensile-proof perforated foil. However, it is desirable to use a large mesh gauze-like woven or knitted fabric with a finish that prevents the threads from slipping.

For example, glass fiber fabrics are particularly easily embedded in the plastic material that later forms the cushioning element.
It is possible to provide effective dimensional stability to the manufactured ground covering. A finish that prevents yarn slippage means that the intersection points of the yarns of which the reinforcing web is constructed cannot move along the yarns, as in normal fabrics with large meshes. .

Other features and advantages of the invention will become apparent from the following description and the accompanying drawings, which illustrate three preferred embodiments of the methods and systems for carrying out the methods according to the invention.

〔Example〕

FIG. 1 shows two deflection rollers 10, one of which is driven by means not shown. Endless conveyor belt 1 made of thin and highly flexible steel band
2 is wound around this deflection roller with the aid of a tension roller (not shown). This conveyor belt runs past an oven 14, the side walls of which are provided with openings for the passing conveyor belt and the web of gland covering. Arrows T and K indicate the situation in which the web of ground covering to be produced is heated from below and cooled from above in this oven.

An applicator drum 20 is disposed above the starting point area on the upper surface of the conveyor belt 12 running in the direction indicated by the arrow, and the drum is rotatably supported around a horizontal axis.
It also has a drum shell 24 with a through opening 22.

These through openings 22 are designed and arranged in accordance with the grid to be formed by the plastic mass placed on the conveyor belt 12. A stationary supply device 26 for plastic material is connected to this applicator drum 20.
A wiper 28 is fixed to the inside of the wiper. Applicator drum 20 is driven in the direction of arrow E by means not shown.

As can be seen in FIG. 2, plastic material 30 is introduced inside the drum shell 24 by the feeding device 26.
is compressed through opening 22 and scraped from the drum shell by wiper 28 to form a plastic mass 34 on conveyor belt 12 according to the desired grid shape.

Plastic material concentration and supply pressure as well as through opening 2
The size and arrangement of 2 is preferably such that the plastic mass 34 is initially placed separately and in the form of a pile or a dot.

One reinforcing nib 36 is provided at a point immediately behind the applicator drum 20 in the direction of travel of the conveyor belt 12 . In particular, this reinforcing web is a fabric consisting of a plastic ribbon with relatively large openings, which is provided with a finish that prevents the threads from slipping.

The deflecting roller 38 for the reinforcing web 36 is connected to the conveyor belt 1
It is rotatably mounted above 2.

The distance from the top surface of the conveyor bell 12 is such that the reinforcing web is initially placed loosely on the plastic mass 34. When the finishing web of the ground covering is pulled to the right in FIG. 1 by known means, not shown, a longitudinal tension is applied to the reinforcing web 34.

The second deflection roller 40 comprises a reinforcing web 36 and a plastic mass 3 on which is placed a water-permeable plastic grass web 42 as described in German Patent No. 2051108.
It has the function of pressing on top of 4. As a result, the reinforcing web 36 is pressed into the plastic material of the plastic mass 34, which comes into contact with the back side of the plastic turf web 42. In this connection, after the plastic turf web 42 has been placed on the conveyor belt 12, it is fed in such a way that its bails 42a are facing upwards.

In the oven 14, the PlusDeck material, preferably foamable soft PVC, is heated to foam and simultaneously solidify to firmly bond the backing coating of the plastic turf web 42 to the plastic turf web's backing coating. The bail 42a is simultaneously cooled from above. FIG. 5 shows the back structure of the plastic turf web 42.

It has a fibrous material support supporting a bail 42a, and between openings 42b ribs 42c constituted by points at which the bail 42a is connected within said fibrous support, said points being for the manufacture of plastic lawns. During this process, it is already coated with a backing material, not shown in FIG. 4, and bonded to the plastic material of the plastic mass 34.

By this method and by foaming the plastic material, a finished ground covering web 50 is obtained, which comprises the bails 42a, the plastic turf web 42
42d and a foamed plastic cushioning element 34.degree., produced by heat treatment of the plastic mass 34 and firmly bonded to the plastic turf web 42.

1, after the ground covering web 50 exits the oven 14, it is pulled out to the right in FIG. This is done by a second conveyor belt, not shown, which forms a support grid with rows of nails along its longitudinal sides, further cooling the gland covering in its shape. The ground covering web is then edge-shaped and rolled up.

The method of the present invention not only reduces the cost of producing ground coverings, but also eliminates the quality risks involved in many single steps.

According to the invention, the dimensions of the plastic masses and the spacing between each other are such that the cushioning element that is finally formed is provided with openings through which the water collected on the surface of the ground covering can flow down or leak. selected to be able to do so.

Instead of a pasty plastic material, it is also possible to place on the conveyor belt 12 a plastic material that can be piled up, i.e. in the form of granules or powder, which are sintered or melted together in the oven 14. The discrete plastic masses are knitted together and foamed to form cushioning elements that are interconnected but with openings in between.

The system of the invention shown in FIG. 6 and the method of the invention carried out thereby differ from the system and method of FIG. 1 only in the order in which each element of the plastic lawn is placed on a conveyor belt. ing. Therefore, the same reference numerals as in FIG. 1 are used in FIG. 6 with a dashed dash.

In this preferred embodiment, the plastic lawn web 42°
is first placed on the conveyor belt 12° with its pile 42a'' facing downwards.The reinforcing web 36'' is then placed on the back side of the plastic turf web 42''. Thereafter, a plastic mass 34' is created and applied to the reinforcing web 36' and the plastic turf web 42' by the applicator drum 20'. As the plastic turf web passes through the oven 14' in the direction of the arrow, the pile 42a' is cooled from below, while the plastic mass 34' undergoes a heat treatment to foam, stabilize its shape and form a foam cushion element 34'. ” becomes.

The opening of the oven 14° for running the composite plastic turf web and the conveyor belt 12° is marked 16°.
It is shown in Plastic lump 34゛ is oven 14
As the plastic material passes through the reinforcing web 36', the plastic material penetrates into the reinforcing web 36', and the foamed plastic cushioning element 34' and the reinforcing web 36' are firmly bonded to the underside of the plastic turf web 42'.

A particularly simple way of producing elastic cushioning elements arranged in a grid on the underside of either a plastic turf web or a support web placed on the underside of an actual plastic turf web is shown in FIG. It is shown. To simplify the diagram, conveyor belt 12 or 1
Only the top side of 2'' is shown without the deflection roller 10 or 10''.

In the method performed by this system, a support web 102 is first placed on a conveyor belt 100. If this is a plastic turf web, it is placed with its pile facing down on a conveyor belt. The direction of travel on the top surface of the conveyor belt 100 is indicated by an arrow. A plastic bundle 106 is created and deposited on the support web 102 by a set of nozzles 104 arranged laterally spaced from each other. This plastic bundle 106, which is likewise laterally spaced from one another, extends in the running direction of the support web 102, ie in the longitudinal direction. Preferably, the plastic material is a PvC plastisol and the support web 102 is a fibrous web with a lattice structure that allows the plastisol to pass through the apertures.

The plastic bundle 106 then passes through a first oven 108, where heat acts on the plastic bundle from above, while the support web 102 is cooled from below. The temperature and transit time are set such that the plastic material of the plastic bundle 106 is somewhat stabilized in terms of shape and is not sticky after leaving the oven. In the case of plastisol, it is slightly gelled. The support web 102 with the plastic bundle 106 then passes under a roller 11O provided with ribs 112 whose cross-sectional shape resembles a compression stamp. The axis of this rib extends at right angles to the running direction and is driven by means not shown in the direction of the arrow E to drive the conveyor belt 100 such that the rib 112 is pressed onto the support web 102 via the plastic bundle 106. held upwards. This forms a lattice-like array of raw cushion elements 114 on the support web 102, which are passed through a second oven 116 where they are foamed to form a shape-stabilized finished pile-like array. A cushion element 118 is formed. This second oven 1
16, heat acts on the plastic material from above, while conveyor belt l-100 and support web 102
is cooled from below.

According to the invention, the plastic bundles 106 are arranged laterally spaced apart from each other, and the ribs 12 are aligned with the support web 102.
is placed on a water-permeable foundation with the cushion elements 118 facing downward, and is designed and arranged so that water that has penetrated into the support web 102 from above flows out from between the cushion elements 118 in all directions. .

Support web 10 in the method according to the invention as shown in FIG.
2 is, of course, a composite web, in particular a lattice-like structure made from a plastic turf web placed with its pile facing down on a conveyor belt and a woven or knitted fabric placed on top of the plastic turf web. It may also be a composite web consisting of another web with

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the first system, and FIG. 2 is a schematic side view of the first system.
3 is an enlarged sectional view of the area where the plastic lump is placed on the conveyor belt; FIG. 3 is a plan view of the area of the conveyor belt where the plastic lump is placed, viewed from the direction of arrow A in FIG. 4 is a back view of the pile fabric forming the plastic turf web seen from the direction of arrow A in FIG. 1 (however, the back coating is omitted); FIG. 5 is an enlarged view of cross section C in FIG. 1; 6 is a schematic side view of the second system; FIG. 7 is a side sectional view of the web of the gland covering after the plastic material has foamed;
FIG. 2 is a schematic side view of the system. DESCRIPTION OF SYMBOLS 10... Deflection roller, 12... Conveyor belt, 14... Oven, 20... Applicator drum, 22... Through opening, 24... Drum shell, 30... Plastic material, 26 ... Feeding device, 28 ... Wiper, 34 ... Plastic lump, 36 ... Reinforcement web, 40 ... Deflection roller, 42 ... Plastic lawn web.

Claims (1)

[Claims] 1. A plastic mass corresponding to a cushion element is made of a quantitatively adjustable plastic material and placed in a grid, and then the plastic material is converted into the cushion element by heat treatment, A plastic lawn web for a sports ground has a pile fabric web forming a front side by being firmly bonded to the pile fabric web at the time of the application, and an elastic cushion element fixed to the back side of the pile fabric web in a lattice shape. A method for manufacturing a pile fabric, comprising placing a web of pile fabric, a plastic mass, and a reinforcing web having an opening on a conveyor belt, the reinforcing web being sandwiched between a lower surface of the pile fabric and the plastic mass. the plastic material penetrates the openings of the reinforcing web and wets the underside of the pile fabric, said plastic material is then heat treated and the web of pile fabric, the reinforcing web and the cushioning element are thereby firmly bonded to each other; A method characterized by: 2. According to claim 1, a water-permeable pile fabric web material is used, the underside of which is partially covered by a coated backing material to be bonded to the plastic material for the cushion element. Method described. 3. Method according to claim 1 or 2, characterized in that the plastic mass is produced and placed by a wiper drum with a shell having discretely provided through openings for the plastic material. 4. Soft foaming PVC as a plastic material
4. A method according to claim 1, 2 or 3, characterized in that: is used. 5. The pile fabric web is pressed onto the reinforcing web;
5. A method according to any one of claims 1 to 4, characterized in that the plastic material is thereby brought into contact. 6. A method according to any one of claims 1 to 5, characterized in that the conveyor belt carrying the plastic mass, the reinforcing web and the pile fabric web is introduced into a heating zone to heat-treat the plastic material. . 7. The method according to claim 6, characterized in that the pile fabric web is cooled from the pile side in the heating zone. 8. The method according to any one of claims 1 to 7, characterized in that the reinforcing web is a gauze-like woven fabric with a large mesh coated with a finishing agent that prevents thread slippage. method. 9. Process according to any one of claims 1 to 7, characterized in that a knitted fabric with a large mesh is used as reinforcing web. 10. A paste that can be cured by heat treatment to form an elastic body, or a powder or particles of plastic that can be raised and sintered or melted by heat treatment is used as the plastic material. The method according to any one of claims 1 to 9. 11. Making a plastic block from a plastic material and placing it on a support web, which is then heat treated to convert it into a grid of elastic cushioning elements, firmly bonded to said support web. a method for producing a web having cushioning elements, the plastic material being deposited on the support web in the form of dot-like or longitudinally extending rib-like plastic masses; A method characterized in that the mass is then mechanically divided at right angles to its longitudinal direction into rows of raw cushion elements, which are then converted into finished cushion elements. 12. Process according to claim 11, characterized in that the bead-shaped plastic mass is divided into green cushion elements by means of ribs or bladed rollers whose axial direction extends at right angles to the longitudinal direction of the support web. 13. Process according to claim 11 or 12, characterized in that the polka-dot-shaped plastic masses are placed on the support web at laterally spaced intervals from each other. 14. Claim 1, characterized in that the ribs of the roller press directly against the plastic mass on the support web.
14. The method according to any one of 1 to 13. 15. A method according to any one of claims 11 to 14, characterized in that, prior to splitting, the beaded plastic mass is heat treated to prevent the plastic from adhering to a splitting tool. 16. A method according to any one of claims 11 to 15, characterized in that the bead-shaped plastic mass is produced using a slightly gelling plastisol prior to splitting.